Diffractive pion production at COMPASS - First results on 3{pi} final states - neutral mode

Journal Article · Thu Aug 05 00:00:00 EDT 2010 · AIP Conference Proceedings

DOI:https://doi.org/10.1063/1.3483335· OSTI ID:21426396

Nerling, Frank ^[1]

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1. Physikalisches Institut, Universitaet Freiburg, Hermann-Herder-Str. 3, D-79104 Freiburg (Germany)

The COMPASS experiment at CERN is designed for light hadron spectroscopy with emphasis on the detection of new states, in particular the search for exotic states and glue-balls. After a short pilot run in 2004 (190 GeV/c negative pion beam, lead target) showing significant production strength for an exotic J{sup PC} = 1{sup -+} state at 1.66 GeV/c{sup 2}, we have collected data with a 190 GeV/c negative charged hadron beam on a proton (liquid hydrogen) and nuclear targets in 2008 and 2009. The spectrometer features good coverage by electromagnetic calorimetry, and our data provide excellent opportunity for simultaneous observation of new states in two different decay modes in the same experiment. The diffractively produced (3{pi}){sup -} system for example can be studied in both modes {pi}{sup -}p{yields}{pi}{sup -{pi}+{pi}-}p and {pi}{sup -}p{yields}{pi}{sup -{pi}0{pi}0}p. Charged and neutral mode rely on completely different parts of the spectrometer. Observing a new state in both modes provides important crosscheck. First results of a preliminary PWA performed on the 2008 data are presented.

• OSTI ID: 21426396
• Journal Information: AIP Conference Proceedings, Vol. 1257, Issue 1; Conference: HADRON 2009: 13. international conference on hadron spectroscopy, Tallahassee, FL (United States), 29 Nov - 4 Dec 2009; Other Information: DOI: 10.1063/1.3483335; (c) 2010 American Institute of Physics; ISSN 0094-243X
• Country of Publication: United States
• Language: English

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COLOR MODEL
DIFFRACTION MODELS
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MULTIPARTICLE SPECTROMETERS
PARTICLE IDENTIFICATION
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